java.lang.IllegalArgumentException: No converter found for return value of type

Add the below dependency to your pom.xml:

 <dependency>
    <groupId>com.fasterxml.jackson.core</groupId>
    <artifactId>jackson-databind</artifactId>
    <version>2.10.0.pr3</version>
</dependency>

The problem was that one of the nested objects in Foo didn't have any getter/setter